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1. The air pump to the diffuser stones will provide enough air exchange. Run the hoses through and seal with silicone.2. The airstone should be under the perlite/hydroton/laverocks.3. Use h2o2 yes.4. The h2o2 should work for this also, try replacing the perlite also.5. Put some vaseline on the lid, should keep the condensation at bay.

If by local RH you mean RH in the setup you gotta get that RH up around 95% also.